you posted similar thing on another thread https://bitcointalk.org/index.php?topic=3120917.0did you find this rawtx somewhere? or you picked some random address, create unsigned rawtx and ask questions herewhat exactly you are trying to achieve? I'm pretty sure those aren't your addresses

Yes, it is certainly a strange transaction. The reason the scriptsig is weird and small is because it doesn't contain any signatures. It's a special case since transactions without any signatures shouldn't be accepted. The scriptsig has to return true for the transaction to be considered valid and in most cases, the condition (ie. transaction is signed by n-of-m parties for multisig) has to be met.

Take the transaction and decode it.

Code:

"script":"0151"

You will notice that the script line is "0151". The redeem script for that address is basically the number 51. It's the hex for OP_True and it is thus valid without the need for a signature.

Anyone-Can-Spend OutputsConversely a transaction can be made spendable by anyone at all:

scriptPubKey: (empty) scriptSig: OP_TRUEWith some software changes such transactions can be used as a way to donate funds to miners in addition to transaction fees: any miner who mines such a transaction can also include an additional one after it sending the funds to an address they control. This mechanism may be used in the future for fidelity bonds to sacrifice funds in a provable way.

Anyone-Can-Spend outputs are currently considered non-standard, and are not relayed on the P2P network.

you posted similar thing on another thread https://bitcointalk.org/index.php?topic=3120917.0did you find this rawtx somewhere? or you picked some random address, create unsigned rawtx and ask questions herewhat exactly you are trying to achieve? I'm pretty sure those aren't your addresses